Cooling fan



FIG. 1 is a front-right-top perspective view of the cooling fan showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a another perspective view thereof; and,

FIG. 9 is a perspective view thereof shown in a position of use.

The broken lines illustrate portions of the cooling fan which form no part of the claimed design. 

CLAIM The ornamental design for a cooling fan, as shown and described. 